Riyadh. At a time when the global oil market is facing its biggest disruption ever, Saudi Energy Minister Prince Abdulaziz bin Salman (ABS) is faced with the difficult challenge of keeping OPEC united.Crude oil exports from the Gulf region have almost come to a halt due to escalating tensions with Iran, and on the other hand, the United Arab Emirates (UAE), OPEC's fourth-largest producer, has announced its surprise departure from the group.The departure of the UAE, which has the second-largest reserve production capacity after Saudi Arabia, raises serious questions about the working style of the Saudi prince and the future...